I have used masking tape also in the past and am trying my darndest to NOT have to use it again. Our new little girl, Halle, it 11 weeks old and her ears are not standing erect.....yet. It really looks like they will come up, and I'd love to see them come up on their own, but my patience is wearing down and I don't want to take the chance of them not coming up. So, I'll probably be taping them in a day or two